using System;
using System.Text;

using Org.BouncyCastle.Utilities;

namespace Org.BouncyCastle.Asn1.X509
{
	/**
	 * The DistributionPointName object.
	 * <pre>
	 * DistributionPointName ::= CHOICE {
	 *     fullName                 [0] GeneralNames,
	 *     nameRelativeToCRLIssuer  [1] RDN
	 * }
	 * </pre>
	 */
	public class DistributionPointName
		: Asn1Encodable, IAsn1Choice
	{
		internal readonly Asn1Encodable	name;
		internal readonly int			type;

		public const int FullName					= 0;
		public const int NameRelativeToCrlIssuer	= 1;

		public static DistributionPointName GetInstance(
			Asn1TaggedObject	obj,
			bool				explicitly)
		{
			return GetInstance(Asn1TaggedObject.GetInstance(obj, true));
		}

		public static DistributionPointName GetInstance(
			object obj)
		{
			if (obj == null || obj is DistributionPointName)
			{
				return (DistributionPointName) obj;
			}

			if (obj is Asn1TaggedObject)
			{
				return new DistributionPointName((Asn1TaggedObject) obj);
			}

			throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
		}

		public DistributionPointName(
			int				type,
			Asn1Encodable	name)
		{
			this.type = type;
			this.name = name;
		}

		public DistributionPointName(
			GeneralNames name)
			:	this(FullName, name)
		{
		}

		public int PointType
		{
			get { return type; }
		}

		public Asn1Encodable Name
		{
			get { return name; }
		}

		public DistributionPointName(
			Asn1TaggedObject obj)
		{
			this.type = obj.TagNo;

			if (type == FullName)
			{
				this.name = GeneralNames.GetInstance(obj, false);
			}
			else
			{
				this.name = Asn1Set.GetInstance(obj, false);
			}
		}

		public override Asn1Object ToAsn1Object()
		{
			return new DerTaggedObject(false, type, name);
		}

		public override string ToString()
		{
			string sep = Platform.NewLine;
			StringBuilder buf = new StringBuilder();
			buf.Append("DistributionPointName: [");
			buf.Append(sep);
			if (type == FullName)
			{
				appendObject(buf, sep, "fullName", name.ToString());
			}
			else
			{
				appendObject(buf, sep, "nameRelativeToCRLIssuer", name.ToString());
			}
			buf.Append("]");
			buf.Append(sep);
			return buf.ToString();
		}

		private void appendObject(
			StringBuilder	buf,
			string			sep,
			string			name,
			string			val)
		{
			string indent = "    ";

			buf.Append(indent);
			buf.Append(name);
			buf.Append(":");
			buf.Append(sep);
			buf.Append(indent);
			buf.Append(indent);
			buf.Append(val);
			buf.Append(sep);
		}
	}
}
